WooCommerce Pro - Validating File After Upload Hook

/*
@param : $files return
Array
(
    [path] => /tmp_uploads/
    [file] => ten.jpg
    [preview] => http://localhost/wc-pro-old/wp-includes/images/media/default.png
    [show_thumbnail] => 1
    [is_image] => 1
    [ext] => jpg
)
*/

add_action('dndmfu_wc_pro_upload_complete', function( $files ){

    // Begin validation here ( checking filename or validating file extension )
    if( isset( $files['file'] ) ){

        // File check or validation here
        if( $files['file'] == 'ten.jpg' ){

            // WP upload url
            $base_dir = DNDMFU_WC_PRO_MAIN::get_instance()->wp_upload_dir['basedir'];

            // Concat upload path + filename
            $path = realpath( trailingslashit( $base_dir ) . $files['path'] . $files['file'] );

            // Delete file
            DNDMFU_WC_PRO_FUNCTIONS::get_instance()->dndmfu_wc_delete_file( $path );

            // Return an error (must json error format)
            wp_send_json_error( 'Error: Invalid file etc...' );

        }
    }

    return $files;
});